Sure I can give you a few reasons. First of all the air is ok but your defiantly not floating the entire ride as on other B&M hypers I've been on such as Goliath. Second the ride lacks a true helix, the spiral into the midcoarse is pretty decent but not tight enough to be considered a real helix and the last helix is a joke. Lastly the braking climbing the hill coming out of the hammerhead really kills a lot of the momentum the ride had up to that point and though the mid-coarse isn't to bad as far as breaking goes the ride post it is fairly tame. I've rode the ride 6 times now from nearly every spot on the train and nothing has changed my mind it simply doesn't quite make it to my amazing coaster list. It's a good ride(like I said probably second best in the park) but its not great either and as far as hype goes this was expected to be the best coaster to open this year and after riding it I'd put my money on either Manta or Prowler taking top honors in best new coaster category.
I must like floater air then because I could barely feel that kind of air at all. As far as ejector air goes I would argue that Diamondback in no way shap or form has ejector air but maybe I need a few more rides. However somehow I feel my opinion has been solidified after 6 rides, though I haven't rode it with shorts on yet so that my change my mind but we'll see.
Edit: The Hammerhead was also pretty weak in my opinion, just don't feel many forces within it.